Blowing Wool - Supafil® 40

Supafil® 40


Masonry cavity walls


Blowing Wool


Supafil® 40 is a glass mineral blowing wool, designed for use in external full-fill masonry cavity walls. It offers thermal conductivity of 0.040 W/mK at the recommended density of 18kg/m3.

Supafil® 40 is non-combustible with the best possible Euroclass A1 reaction to fire classification.


  • Holds an Agrément certificate by the BBA for use in all exposure zones, including those in very severe areas.
  • Suitable for use in wider cavities of up to 125mm.  
  • Made with a water-repellent additive to resist moisture ingress.
  • Installed by 'Approved Supafil® Installers', using specific blowing machines, hoses and nozzles as part of a system.

*When treating cavities wider than 125mm please contact our TST to review and assess the suitability for installation with the approved installer prior to works commencing on site. Alternatively, designers should consider use of Supafil 34; BBA 11/485.

For historical versions of product documentation, or documents relating to any discontinued products, please contact us with your requirements at [email protected].



Thermal Conductivity (W/mK) Euroclass Reaction to Fire Classification Packs per pallet
0.040 A1 28

Certification & Memberships

Supafil 40 BBA logo - Certificate No: 88/2033 Supafil 40 BBA logo - Certificate No: 88/2033
Eurofins Gold Eurofins Gold
Euroclass A1 Reaction to Fire Classification Euroclass A1 Reaction to Fire Classification
Green Guide Rating A+ Green Guide Rating A+
CE Marking CE Marking
EN 15804 EN 15804
Made in Britain Made in Britain
DECLARE 'Red List Free' DECLARE 'Red List Free'


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